Computing-machine.



J. W. MILLER. COMPUTING MACHINE. AYPLIGATION FILED 11m: 23,1911v Patented Feb. 18, 1913.

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FZLED HAY28,1911.

APPLICATION Patented Feb. 18, 1913.

2 SHBETS-SHEET 2.

it an JOSEPH W. MILLER, 0F

scribed as follows; .Figure 1 is a top VIEW with a portion of the cover broken away. Fig. 2 is asectional view. Fig. 3 i a cross section illustrating the turn to zero mechanism. Fig. i is the operating rack for addition and subtraction. Fig. 5 is the operating rack, reduced size, for multiplication and division. Fig. i is a view'of the lefi hand side of one of the wheels showing the transfer pinion in normal position. Fig. 7 is the right hand side View of a registering wheel with the transfer pinion in. mesh therewith. Fig. 8 a view-of the right hand side of one of the registering Wheels showing a modified connection to 1 modified pinion. Fi 9 is the turn to zero'shaft. Fig. 10 is a modified form of turn to zero shaft. 11 is a fragmentary View of the left hand side oi" the case showing how the turn to zero shaft is held in normal position.

- The mechanism is mounted in a suitable case.

1 indicates the bottom, 2 the right hand side, 3 the left hand side, 4 the front end, 5 the back end and 6 the top of the ease rcspect-ively; 7 indicates slots in the top ends of the case, 8 a d 9 the sight lines or openings for reading the indicating Wheels re spectively. I

The computing mechanism consists of a series of like indicating or registering wheels 10 loosely mounted on a shaft 11, which has its hearings on the side of the case 2 and 3, and a series of like pinions mounted. on a parallel shaft .12, that gear with the said indicating Wheels, and a series of like springs 13 to engage with said pinionsto aid in locating and to hold the indicating Wheels 10 with one each of their figures res'pectivelv at the sight opening.

Specification of Letters Patent.

.A) lication filed Maw 23, 1911. Serial lie. 6% 98?.

res O to 9 on its 1r 15 of ten teeth,

\\ till l 'ipl ttached to its ver r, with spur In a certain pitch d J t side and an ime 1 it. of e diile ent pitch (on ear et one a. in the said a 18 to mesh continuously with the and a smaller gear 19 rigidly it tohe intermittently engaged by the tooth ii The teeth oi gear 19 ot the pinion are hiv thin and flat with roui'ided tacos and 1e single teeth. It shaped so that it will the more quickly engage when hein moved, from 9 to O, the carr ,'ing over L! anti continue the engagement to the end or nearly so of said st 7; or in other Words until the tooth clears itself.

is app, i this ((dtrStIlllltlOIl permite the n o operate in either direction thus e. i .e' hoth additioiii and. subby the wheel of h to move one step at ing over period or the said wheel of lower denoin ina non.

The turn to zero mechanism consists of the revel i ile sh it. it with line of teeth 20 out in its peiuvhery, one tOO'ti'i tor eaeh wl'ieet it). this shaft-hes its hearings on the sides oil. the ease a '4 in its left hand end is a pin n" 1 holds it in normal iiositicm it? being drawn into the slottej plate 2*" on t side of the ease, by the spiral upon this shaft 3) are loosely mounted the series oi whee s 10 with their sprin pressed pins 1? riding thereon, when the. s iajtt in. normal position, and which are engaged the teeth of said shaft when the shaft is shifted o that tho tee l". are in the ath of aid wherelrv said teeth pick up and zero the Wheels respective; as is com with one revolui shaft.

tion of niodit alion oil? sln. .t, 1 w '1 i '1. 7' J; 11 can he inane w nuoinai groom on the s k :i'or each n n l through sition. See

the length of nine teeth and bent over indicating wheels 25) and above them is a sight opening 9. in the top of the case, for reading the items as they appear respectively. Each wheel consists ot a disk {'16 with two sets of figures t) to 9 halt way around in one direction and t) to t) halt way around in the other direction. to one side of each disk a spur It of twenty teeth secured, to corresp nd with the figures respectively, a spiral spring 91% is fastened to each wheel at 19 and secured to the ba k 5 and a spring 30 is placed in operati e engagement with the gear 2?. a crank oar :31 common to all of the springs 30 is pivoted to the sides of the ease to release the wheels 25 when held by the sprin 's St) in operated position so that the springs 28 may draw them back to normal position. In operation these wheels 25 revolve toward the back of the case when adding and toward the front when subtractin The operating means in this construction consists of a rack (Fig. 4.) made otsheet metal. The rack is cut down in the middle at a right angle, the bent portion having nine saw shaped teeth in line with the rack teeth and the figures 9 to 1 stamped thereon at the said 9 teeth respectivt-rly and the ratelwt teeth corresponding marked in reverse order 1 to 9; the said nine teeth including the next tooth to number 1 are used tor addition and subtraction; the teeth at each end are used to engage the item iinlieating spur gear This rack has a portion bent over at right angles at each end so that the rack will be stopped by the bent parts striking the, back and front of the ease in :nldition and subtraction respectively.

The rack (Fig. 5') division is made of a with eighty two teeth a table stamped thereonQthe table is a division of eighty one teeth by vertical. lines which are numbored and marked on hm'izontal lines as follows: The first line counting from the bot tom up is the 91s line and has 9 divisions.

for multiplication and piece of sheet metal the first division is indicated by the figures 1 to 9 from the right hand end. the other divisions in nlu'uerical order 2 to .l this line is indicated by 9 its left end, the second line is the 8s line indicated by S at both ends and numerically divided into 9 spaces from 1 to 9 respectively, the '75 to 2" line are indicated suce SSlVGly above ach other each being divided and marked into 9 divisions; a pin 32 is secured to the rack which constitutes the stop. When using this rock a device without. the item indicating wheels 26 is used or else these wheels are-shifted out of engagement wit. the rack in any well known manner. it will be observed that this rack will, in use, pass through the slots 7 until arrested by the pin 32. To operate in addition place the rack (l ig.

-will also engage the wheel 25 proving the operation.

4-) with the whereby ratchet tooth bearing the figure of the number you want to add, as indicated by the saw teeth, into engagement with the spur gear 15 of the wheel 10 of the denomination you want to add and push it; till the bend 33 on its end strikes the back of the case. To sub-' tract place the rack tooth bearing the figure of the number you want to subtractinto engagement with the spur gear 15 of the wheel 10 of the denomination that you wantto subtract and pull it until the bend 34 strikes the front end of the case. It will be observed that when placing the rack, Fig. 4, into engagement with the wheels 10 thatit and move it as many steps as it moves the Wheel 10 thus T he wheel 96 must always be released by the bar 81 through' the push button 35 after-each item has been registered. To multiply say 357 by 52 run your eye along the 5* line until it rests at 3, place the tooth indicated by the vertical line at said 3 into engagement with the gear on the thousands wheel and push it till the pin 13 strikes the back of the case, then place the tooth on the hundreds wheel and operate as before, then with the 5X7 tooth on the tens wheel operated upon you will getthe result of 530x357 indicated; then with the 2X3 tooth eng then the 2X5 tooth the tens wheel then the 2X? tooth the units wheel and you will have the result of 512x237 indicated at the sight opening 8.

To perform division turn the case end for end and operate the same as in multiplicatirn. mark down the number of each denomination as it is operated thus in dividing 7504 by S you would mark down 938 as the 9 in the hundreds, 3 'n the tens and 8 in the units denominations were manipulated, respec-' lively.

lllodifications may be made in construction from the herein disclosed means with outdeparting from the spirit and scope of my invention hence I do not wish to be limited to the details as set forth.

.Ilaving thus described my invention what I claim and desire to secure by Letters Patent, is

1. In a computing machine and like devices a series of like wheels having respectively a full gear of a certain pitch diameter on one side and an intermittent gear of one tooth of a. ditlerentpitch diameter on the other side and a series of like differential transfer or carrying over pinions, said pinions re pectively meshing and engaging each two adjacent wheels therewith, the gear of the wheel of higher denon'iination being in mesh with the. one end of the pinion and the gear with one teeth of the wheel of next; lower denomination in intermittent engagementwith the other end of said pinion said single tooth drives the transone shaped tooth of a different pitch diameter on the other side and a series of like a differential transfer or carrying over pinions, said pimons respectively meshing and engaging each twoadjacent wheels therewith, the g'ear of the wheel of higher denomination being in mesh with an); oneend of the pinion having suitable teeth and the gear with one tooth of the wheel of next lower denomination in intermittent engagement with the other end of said pinion having flattened teeth whereby said single tooth drives the transfer gear intermittently in either direction, substantially as described and set forth.

3. In a computing device and the like in combination ,with a series of indicating wheels each having a spring pressed in therein, a rotatable and laterally mova 1e,

shaft with a line of teeth out in its periphery, one tooth for each wheel revolubly mounted thereon, said pins riding on the periphery of the shaft when it is in normal position and in the path of said teeth when the shaft is shifted whereby the said wheels are picked 11 respectively and turned to zero, as descri ed and set forth.

4. In a computing device a series of indicating wheels, with a double set of figures on their peripheries, being 0 to 9 one half Way around in one direction and 0 to 9 half way around in the opposite direction, revolubly mounted. on a shaft, a spur gear at tached to the side of each, a returning and locating to Zero spring, a spring pawl and a release crank bar with push pin, substantially as described and set forth.

For a computing device a rack with the middle portion cut down and bent at a right angle with nine saw teeth on the edge of said bent part and numbered 9 to 1 respectively and nine of the ratchet teeth corresponding therewith numbered reversely 1 to 9 as described and set forth.

6. For a computing device a rack with a pin attached, combined with the teeth numerically divided into a scale by vertical lines which are numbered and marked on cross horizontal lines substantially as shown and described and for the purpose set forth.

7 In a computing device and the like a rotatable and laterally movable shaft with a line of teeth cut in its periphery, one tooth for each wheel revolubly mounted thereon.

Witness my hand at Harrisburg, Pennsyl- Vania, this twenty second day of May 1911.

JOSEPH W. MILLER.

Witnesses:

EDWARD PELHAM, LUTHER K. BURGER. 

